Tier 3 Class Catalysts

Ghostboytjie

I recently got a 5* blade after completing 5.4 and i need 2 Tier 3 Skill Catalysts to R2 him then i can R3 him but ...
I am currently grinding today's class but keep getting so little frags. Is there anyway to get it faster?

Nitro422

You can't one day to rank him up?